Indoor opto-acoustic alarm indicator dedicated for Z-Wave network. Product is very useful with other Z-Wave devices especially with sensors (flood, smoke, CO2, door/window). The SE812 Siren has an adjustable jumper inside, so you can choose between either a 90dB or a 100 dB volume of the siren. Choose either the included batteries or a power supply to power your siren. When using batteries, the siren will give a warning when the batteries are almost empty.